Brendon's Koi Pond Journey

It all started with a Butler Sink and two goldfish ! 

My journey with ponds goes right back to childhood. My grandad had a pond at the bottom of his garden, and I spent hours down there, completely fascinated—catching frogs and newts and getting my first real taste of what would become a lifelong passion.

As I got older, that love of water and wildlife naturally led me into fishing. I spent most of my school summer holidays by my local pond, rod in hand, happily losing track of time.

Eventually, I built my own pond in my parents’ garden, which kept that interest alive. Years later, in my current garden, I started small again with a simple Butler’s sink water feature. Then one Easter, my mum gifted me two goldfish… and that was the spark that reignited everything.

From that moment on, the passion grew quickly.

I had always wanted to keep koi, but space was limited. That didn’t stop me—I built my first pallet pond, making the most of what I had. But as any koi keeper knows, they don’t stay small for long. Within a year, the fish had grown, and it became clear the pond needed to grow with them.

And that’s where the real journey really began.

As you can imagine, with a bigger pond came more koi… and with more koi came a deeper dive into the hobby.

The more I learned, the more I realised just how much there is to koi keeping. It’s not just a pond and a few fish—it’s water quality, filtration, growth, bloodlines, and a constant drive to improve your setup.

I was fortunate enough to spend a season working at a local koi dealer, which gave me a completely different perspective on the hobby. It opened my eyes to one of the many sides of koi keeping—from selecting fish and understanding quality, to seeing how different systems are run and maintained.

That experience helped shape how I approach my own pond and pushed me to take things to the next level.

My current pond sits at around 5,000l and is filtered using a Nexus 320 system. It’s a pump-fed setup with a retro-fit bottom drain, which has worked well for keeping things clean without a full rebuild. The Nexus also has a built-in 36w UV, helping keep the water clear, especially through the warmer months.

I’m currently running an 8,000 lph pump, dialled back to around 30–50%, which I’ve found gives the perfect balance of flow for my pond. It keeps everything turning over nicely without overworking the system or disturbing the fish.

Like most things in koi keeping, it’s been a case of tweaking and refining over time to find what works best—and this setup has been a solid stepping stone.

Now, as my understanding continues to grow and I’m learning something new every day, I’ve come to truly appreciate the time, skill, and dedication that goes into producing these incredible fish for us all to enjoy.

But now… I’m onto my next build.

What started as a hobby has grown into something much more, and like most koi keepers, I’ve reached that point where the current setup just isn’t enough anymore. The plan now is to build a pond that not only gives the koi more space to grow, but also allows me to put everything I’ve learned into practice.

Like any build, it comes with its challenges, but that’s all part of the journey. And for me… this is that next step.

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Harry's Koi Pond Journey

 

My journey with ponds began with a simple love for fishing.

Fishing has always been more than just a hobby for me, it’s a way to switch off from the noise of everyday life. Whenever I had spare time, I’d be by the lake with a rod in hand, watching the water ripple in the breeze and waiting for that unmistakable bite. Many of those days turned into nights, simply enjoying the calm and being by the water.

That connection with nature eventually led me to build my first pond. With the help of a friend, I put together a makeshift setup using an old swimming pool. It wasn’t perfect and, like most first attempts, it came with its challenges. But it sparked something much bigger, a real passion for keeping koi.

As I learned more, I quickly realised that koi keeping is about far more than just having beautiful fish. It’s about understanding water quality, filtration, and creating a balanced environment where everything works together properly. Through this, I met other enthusiasts and continued to build my knowledge.

Building My Own Pond

Fast forward to today, my partner and I have moved into our first home together. From the very beginning, I knew I wanted to create a garden centred around a koi pond, somewhere that brings that same sense of peace and relaxation you get by the lake.

The build started with digging out around 10 tons of soil by hand to form the foundations. I then put down 150mm of compacted hardcore, followed by 125mm of reinforced concrete with steel mesh. This gave me a strong, level base that should last for years to come.

I built the structure using 7.3N concrete blocks. One thing I had always wanted was a large viewing window at the front of the pond facing the house, and I made sure to include it as part of the design.

Once the structure was complete, I had a custom box weld liner made to fit perfectly. With the liner and window installed, it was finally time to fill it up, which was a big moment in the whole build.

Filtration and System Setup

The pond holds around 8,000 litres and is currently filtered using a Nexus 200 system connected to a 4 inch aerated bottom drain. I am also running a 55 watt UV which helps keep the water clear, especially through the summer months.

Water movement is powered by a 20,000 Evolution Aqua Varipump. This usually runs at around 50 to 60 percent during summer and is reduced to around 10 to 20 percent in winter, which gives a good balance of flow throughout the year.

There are two returns into the pond. One feeds a 90cm water blade which also helps when warming the pond as we move into spring. The second is a 2 inch return at the bottom of the pond which helps move waste around and back towards the bottom drain.

What’s Next

The pond is not completely finished yet and there is still more to do. The next steps are to tile the outside, build a pergola, and add the final touches that will really bring everything together.

The aim has always been to create a space where I can relax, unwind, and enjoy the koi.

This is still a work in progress, and I am looking forward to seeing how it all comes together.

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